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1 Electricity Storage for Short Term Power System Service Forskel Allan Schrøder Pedersen Materials Research Division Risø - DTU

2 Aim of the project To evaluate and compare technically and economically the available options for using dedicated electricity storage units to provide short term system services at transmission level in the Danish power system. To conclude with recommendations for a second project phase, where one or more demonstration storage systems will be tested experimentally. Project Period: March End of

6 Ancillary services in Denmark today and tomorrow Ancillary services are today provided by thermal power plants and supplementary generators like gas generators fed by natural gas. DoE has estimated that for every gigawatt (GW) of wind capacity added, for example, 17 megawatts (MW) of spinning reserves must also be built to account for the system s variability 6 Boston ExCo 62nd Sept

10 Schematic drawing of a vanadium battery. The aqueous electrolyte is pumped into the fuel cells (here only one cell is depicted) on each side of the cell membrane. The concentration of the different vanadium ions in the two electrolytes leads to an electrochemical potential over the cells. 10

11 Testing the flow battery at Risø DTU State of Charge as function of time (from April 2008 to August 2009).

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EssPro Energy Storage Power Conversion System (PCS) The power to control energy EssPro PCS gives you the power to control energy helping to keep smart grids in balance Maximizing the value and performance

EVALUATION OF FLICKER LEVEL IN A T&D NETWORK WITH A LARGE AMOUNT OF DISPERSED WINDMILLS H. Knudsen V. Akhmatov The amount of installed wind power capacity in Denmark is very large, when seen relatively

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Development and Operation of a Wind Power Based Energy System : Experiences and Research Efforts Professor and Head of Center Jacob Østergaard Technical University of Denmark (DTU) (With acknowledgement